Guard macOS Namespace fallback retries

services/forgejo-nsc/internal/nsc/macos_nsc.go

@@ -52,6 +52,21 @@ func normalizeMacOSNSCMachineType(machineType string) (normalized string, change
 	return normalized, changed, nil
 }
 
+type macosNSCAttemptConfig struct {
+	waitTimeout   time.Duration
+	createTimeout time.Duration
+}
+
+func macosNSCAttemptConfigFor(index int, attempts []macosNSCAttemptConfig) macosNSCAttemptConfig {
+	if len(attempts) == 0 {
+		return macosNSCAttemptConfig{}
+	}
+	if index < len(attempts) {
+		return attempts[index]
+	}
+	return attempts[len(attempts)-1]
+}
+
 func (d *Dispatcher) launchMacOSRunnerViaNSC(ctx context.Context, runnerName string, req LaunchRequest, ttl time.Duration, machineType string) error {
 	if machineType == "" {
 		return errors.New("machine_type is required for macos runners")
@@ -92,17 +107,13 @@ func (d *Dispatcher) launchMacOSRunnerViaNSC(ctx context.Context, runnerName str
 	}
 	candidates = uniq
 
-	type attemptCfg struct {
-		waitTimeout   time.Duration
-		createTimeout time.Duration
-	}
-	attempts := []attemptCfg{
+	attempts := []macosNSCAttemptConfig{
 		{waitTimeout: 6 * time.Minute, createTimeout: 8 * time.Minute},
 		{waitTimeout: 4 * time.Minute, createTimeout: 6 * time.Minute},
 		{waitTimeout: 3 * time.Minute, createTimeout: 5 * time.Minute},
 	}
 
-	createInstance := func(mt string, a attemptCfg) (instanceID string, out string, err error) {
+	createInstance := func(mt string, a macosNSCAttemptConfig) (instanceID string, out string, err error) {
 		tmpDir, err := os.MkdirTemp("", "forgejo-nsc-macos-*")
 		if err != nil {
 			return "", "", fmt.Errorf("mktemp: %w", err)
@@ -173,10 +184,7 @@ func (d *Dispatcher) launchMacOSRunnerViaNSC(ctx context.Context, runnerName str
 		lastErr    error
 	)
 	for i, mt := range candidates {
-		a := attempts[i]
-		if i >= len(attempts) {
-			a = attempts[len(attempts)-1]
-		}
+		a := macosNSCAttemptConfigFor(i, attempts)
 
 		d.log.Info("launching Namespace macos runner via nsc",
 			"runner", runnerName,